Title: Test device for dynamically measuring the degree of dirt accumulation on bank-notes

Abstract: A device for dynamically measuring the degree of dirt accumulation on bank-notes in which certain areas of the bank-note are illuminated and examined by means of a receiving unit. The light from a succession of adjacent elemental areas of a bank-note so illuminated is dependent upon the degree of dirt accumulation and is converted into a corresponding electric signal. The signal is analyzed to determine the number and amount of changes due to dirt accumulated in creases, and the analyzed signal is integrated to determine whether or not the number and nature of areas of accumulated dirt makes the ban-note unsuitable for further circulation.

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Inventors: Guter, Norbert (Munich, DE, US)
Gier, Josef (Munich, DE, US)
Bernardi, Herbert (Arget, DE, US)
Lehle, Erhard (Muelheim, DE, US)

Application Number: 855734
Filing Date: 1977-11-29
Publication_date: 1980-02-19
Assignee: G.A.O.Gesellschaft fur Automation und Organisation mbH (DE)
Primary Class(es): 356/239.1 209/534, 250/559.12, 250/559.41, 356/430
Other Classes:
US Patent Ref:

3718823	Feb, 1973	Niikura et al.	209/534.
3922557	Nov, 1975	Carne, Jr.	209/534.

Other Refs:
Primary Examiner: Corbin, John K.
Assistant Examiner: Koren, Matthew W.
Attorney: McGlew and Tuttle